Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 2-3 exchange used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. nevertheless had issues. put up to to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty similar to this car.. bought a used one.. more trouble. had the original one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS dependence to be re-adjusted? The master tech did every sorts of diagnostics upon every related parts (tps, maf, iac). $100-200 all era I endure it pull off the dealer for diagnostics.. upon going problems are in reality totaling up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car up this morning, it starts up and runs at 1750 and within a minute or hence climbs beyond 2500.. It is organization serene though, just showing off far along than it should be. I plus checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it help to exactly where it was. No vacuum leak sounds and all links verified. I feel good virtually them as I’ve been in there a bunch of times..
as soon as I start the car, the engine surges happening amid 1200 and 2000 rpm urge on and forth. I changed the IAC and the TPS later than no correct in symptoms. I have noticed that several Lexus SC’s have this similar issue. Prior to this I would have to adjust the idle eagerness screw to belittle the rpm and it would withhold for a while. Now, the engine is for all time surging to the dwindling where I cannot steer it for siren of broken to the steer train. Any experienced solution?
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